Attenuation of a narrow monochromatic X-ray beam in a metal plate of thickness d is given by:
A. $$I = {I_0}{e^{ - \mu d}}$$
B. $$I = {I_0}{e^{ - \mu {d^2}}}$$
C. $$I = {i_0}{e^{ - \frac{\mu }{d}}}$$
D. $$I = {i_0}{e^{ - \frac{{{\mu ^2}}}{{{d^2}}}}}$$
Answer: Option A

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